Thanks @PinkElephant and @gazumpedfor your responses.
@PinkElephantYou are completely right. The thing is... I never posted this (and would never post something so rudely and/or with an SVG attachment).
So I expect my account to be compromised and the attachment to be suspicious. I did remove it from the post (because it is in my account I can access it) and advise anyone that has opened it to check their device.
I have also updated passwords to prevent this from happening again.